Bacterial fermentation platform for producing artificial aromatic amines.

Area of Science:

• Biotechnology
• Metabolic Engineering
• Synthetic Biology

Background:

• Aromatic amines, including aniline derivatives, are crucial in natural and synthetic compounds for materials and bioactive molecules.
• Current production methods for aromatic amines are limited, lacking efficient bio-production platforms.
• The need for sustainable, bio-based alternatives to petroleum-derived chemicals is increasing.

Purpose of the Study:

• To construct and optimize a bacterial platform for the bio-production of para-substituted aminobenzene derivatives.
• To engineer artificial metabolic pathways for converting key intermediates into valuable aromatic amine products.
• To demonstrate the feasibility of using this platform for producing diverse aromatic amines from renewable biomass.

Main Methods:

• Engineered a bacterial metabolic pathway in Escherichia coli, utilizing enzymes from an alternate shikimate pathway.
• Optimized glucose conversion to 4-aminophenylalanine, achieving high titers in fed-batch cultivation.
• Designed and implemented artificial pathways mimicking the fungal Ehrlich pathway for downstream conversions.

Main Results:

• Achieved efficient conversion of glucose to 4-aminophenylalanine (4.4 g L⁻¹) in engineered E. coli.
• Converted 4-aminophenylalanine to 4-aminophenylethanol and 4-aminophenylacetate with high molar yields (90%).
• Successfully fermented glucose to produce 4-aminophenylethanol, 4-aminophenylacetate, and 4-phenylethylamine using the integrated platform.

Conclusions:

• Established a novel bacterial platform for the bio-production of aromatic amines, including para-substituted aminobenzenes.
• Demonstrated high efficiency and yield in producing valuable aromatic amine compounds from glucose.
• Highlighted the potential of this bio-based platform for creating sustainable materials and replacing petroleum-derived chemicals.